@B00G3r

You can try emailing the seller and see if he answers but i doubt it.
Best thing to do is make a claim with Paypal for 'goods being sold not as described',you usually have to then wait for the seller to respond but that can take some time so 24hrs after you make the claim go back to paypal and escalate it to a 'full claim' (cant remember the complete wording but you will see what i mean when you go back in).
You also have to say what would be acceptable compensation you would accept against the claim,so if you have 1gb and should be 2gb take a look at what the 1gb's sell for,deduct a bit more for all your trouble and see what happens.
If the seller now doesnt repsond Paypal themselves will make the decision.
Dont forget to go back and update your feedback to let others know what a con-artist they are.

Good luck!!!